Using CDN.net with Magento is easy! No plug-in's required!
Magento has native support for CDN's and here is a quick guide to getting started...
Login to admin panel of Magento, redirect to Store -> Configuration
Under General section, select Web -> Base URLs (for http scheme), Modify Base URL for static View Files and Base Url for User media files, with http://<your cdn hostname>/pub/static/ ( this is the default static path for static content, your site static path might be different from this, adjust accordingly.)
Scroll down to Base URLs (Secure), do the same things as step 2, but modify the scheme to HTTPS
- You must replace <your cdn hostname> with the URL you have configured in the CDN.net portal.
- If you use custom font in your website, make sure to set Allow CORS for the font files.